Mechanical properties of rolled and aged AA6061 sheets at room-temperature and cryogenic environments

We prepared AA6061 sheets by room-temperature rolling and low-temperature aging. We tested the tensile mechanical properties of the sheets at room temperature and cryogenic (173 K) temperature. The maximum difference between the cryogenic ultimate tensile strength and room-temperature ultimate tensile strength was 50 MPa for the sheets subjected to a rolling reduction ratio of 50% and aging at 393 K for 10 h. As the rolling reduction ratio increased, the lattice friction stress, dislocation strengthening, and precipitation strengthening of the material gradually approached a limiting value, thus reducing the difference between the strengths of the samples tensile tested at room temperature and cryogenic temperature. (C) 2020 Elsevier B.V. All rights reserved.

Automated summary

The study found that as the rolling reduction ratio of the aluminum alloy sheets increased, the various strengthening mechanisms of the material gradually approached a limiting value, thereby reducing the difference in tensile strength between samples tested at room temperature and cryogenic temperature.